$\left(am+bn\right)\left(am-bn\right)$
$\frac{5}{6}a^2-\frac{5}{12}a^2b$
$\frac{x}{4}+3x=2x-5$
$9x-12$
$n^2+11n$
$\left(5a^2y\right)\left(-6x^2\right)\left(-3a\right)$
$7x^2-28=0$
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